/* =========================================================
   Maildeno Docs — site.css
   Satoshi font · Responsive sidebar · Nested nav · ToC
   ========================================================= */

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --font-sans: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;

  --color-bg:          #ffffff;
  --color-surface:     #f9fafb;
  --color-surface-2:   #f3f4f6;
  --color-border:      #e5e7eb;
  --color-border-2:    #d1d5db;

  --color-text:        #111827;
  --color-text-2:      #374151;
  --color-text-muted:  #6b7280;
  --color-text-faint:  #9ca3af;

  --color-accent:      #4f46e5;
  --color-accent-h:    #4338ca;
  --color-accent-bg:   #eef2ff;
  --color-accent-bg-h: #e0e7ff;

  --color-code-bg:     #1e1e2e;
  --color-code-text:   #cdd6f4;

  --topnav-h:    60px;
  --sidebar-w:   272px;
  --toc-w:       224px;
  --content-max: 760px;

  --radius-sm: 4px;
  --radius:    8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / .07), 0 1px 2px -1px rgb(0 0 0 / .07);
  --shadow:    0 4px 6px -1px rgb(0 0 0 / .08), 0 2px 4px -2px rgb(0 0 0 / .08);

  --transition: 150ms cubic-bezier(.4,0,.2,1);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}
img, svg { display: block; max-width: 100%; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; cursor: pointer; border: none; background: none; }

/* ── Top nav ─────────────────────────────────────────────── */
.topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topnav-h);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}
.topnav__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 100%;
  padding: 0 6px;
  max-width: 1600px;
  margin: 0 auto;
}
.topnav__left  { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.topnav__links { display: flex; align-items: center; gap: 4px; flex: 1; }
.topnav__right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }

.topnav__links a {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text-2);
  transition: background var(--transition), color var(--transition);
}
.topnav__links a:hover { background: var(--color-surface-2); color: var(--color-text); text-decoration: none; }

.topnav__logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 700; font-size: 1rem; color: var(--color-text);
  text-decoration: none;
}
.topnav__logo-mark {
  width: 30px; height: 30px;
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-sm);
  display: grid; place-items: center;
  font-size: .875rem; font-weight: 700;
  flex-shrink: 0;
}
.topnav__logo:hover { text-decoration: none; }

.sidebar-toggle {
  display: none;
  align-items: center; justify-content: center;
  width: 36px; height: 36px;
  border-radius: var(--radius-sm);
  color: var(--color-text-2);
  transition: background var(--transition), color var(--transition);
}
.sidebar-toggle:hover { background: var(--color-surface-2); color: var(--color-text); }

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: .875rem; font-weight: 600;
  transition: background var(--transition), color var(--transition), box-shadow var(--transition);
  text-decoration: none;
}
.btn--sm { padding: 6px 12px; font-size: .8125rem; }
.btn--primary {
  background: var(--color-accent);
  color: #fff;
}
.btn--primary:hover { background: var(--color-accent-h); text-decoration: none; color: #fff; }

/* ── Layout shell ─────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--toc-w);
  grid-template-rows: 1fr;
  min-height: calc(100vh - var(--topnav-h));
  margin-top: var(--topnav-h);
  max-width: 1600px;
  margin-left: auto;
  margin-right: auto;
}

/* ── Sidebar overlay (mobile) ─────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgb(0 0 0 / .45);
  z-index: 89;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.is-visible { display: block; }

/* ── Left Sidebar ─────────────────────────────────────────── */
.sidebar {
  position: sticky;
  top: var(--topnav-h);
  height: calc(100vh - var(--topnav-h));
  overflow-y: auto;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-2) transparent;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-track { background: transparent; }
.sidebar::-webkit-scrollbar-thumb { background: var(--color-border-2); border-radius: 9999px; }

.sidebar__inner { padding: 20px 16px 40px; }

/* Search */
.sidebar__search {
  position: relative;
  margin-bottom: 20px;
}
.sidebar__search-icon {
  position: absolute;
  left: 10px; top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-faint);
  pointer-events: none;
}
.sidebar__search-input {
  width: 100%;
  padding: 7px 10px 7px 34px;
  font: inherit;
  font-size: .8125rem;
  color: var(--color-text);
  background: var(--color-bg);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.sidebar__search-input::placeholder { color: var(--color-text-faint); }
.sidebar__search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgb(79 70 229 / .12);
}

/* Nav sections */
.nav__section { margin-bottom: 0px; }
.nav__section + .nav__section { margin-top: 0px; }
.nav__section-label {
  padding: 6px 8px 4px;
  font-size: .6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--color-text-faint);
}
.nav__list, .nav__sublist { list-style: none; }

/* Nav items */
.nav__link {
  display: flex;
  align-items: center;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text-2);
  transition: background var(--transition), color var(--transition);
  line-height: 1.4;
}
.nav__link:hover { background: var(--color-surface-2); color: var(--color-text); text-decoration: none; }
.nav__link--active {
  background: var(--color-accent-bg);
  color: var(--color-accent);
  font-weight: 600;
}
.nav__link--active:hover { background: var(--color-accent-bg-h); text-decoration: none; }

/* Group toggle (nested) */
.nav__item--group { margin-top: 0px; }
.nav__group-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  font-size: .875rem;
  font-weight: 500;
  color: var(--color-text-2);
  transition: background var(--transition), color var(--transition);
}
.nav__group-toggle:hover { background: var(--color-surface-2); color: var(--color-text); }
.nav__group-toggle[aria-expanded="true"] { color: var(--color-text); }
.nav__chevron {
  flex-shrink: 0;
  transition: transform var(--transition);
  color: var(--color-text-faint);
}
.nav__group-toggle[aria-expanded="true"] .nav__chevron { transform: rotate(180deg); }

/* Nested sublist */
.nav__sublist {
  overflow: hidden;
  max-height: 0;
  transition: max-height 280ms cubic-bezier(.4,0,.2,1);
  padding-left: 16px;
  border-left: 1.5px solid var(--color-border);
  margin-left: 12px;
  margin-top: 0px;
}
.nav__sublist.is-open { max-height: 600px; }
.nav__sublist .nav__link { font-size: .8375rem; font-weight: 400; }
.nav__sublist .nav__link--active { font-weight: 600; }

/* ── Main content ─────────────────────────────────────────── */
.main {
  min-width: 0;
  border-right: 1px solid var(--color-border);
}
.main__inner {
  padding: 40px 48px 80px;
  max-width: var(--content-max);
  margin: 0 auto;
}

/* Breadcrumbs */
.breadcrumbs { margin-bottom: 24px; }
.breadcrumbs ol {
  display: flex; align-items: center; flex-wrap: wrap;
  list-style: none; gap: 4px;
  font-size: .8125rem; color: var(--color-text-muted);
}
.breadcrumbs li { display: flex; align-items: center; gap: 4px; }
.breadcrumbs li + li::before { content: '/'; color: var(--color-border-2); }
.breadcrumbs a { color: var(--color-text-muted); }
.breadcrumbs a:hover { color: var(--color-accent); }
.breadcrumbs [aria-current="page"] { color: var(--color-text-2); font-weight: 500; }

/* ── Article typography ───────────────────────────────────── */
.article { color: var(--color-text-2); }

.article h1, .article h2, .article h3, .article h4, .article h5 {
  color: var(--color-text);
  font-weight: 700;
  line-height: 1.25;
  scroll-margin-top: calc(var(--topnav-h) + 16px);
}
.article h1 { font-size: 2rem;   margin-top: 0;    margin-bottom: 20px; letter-spacing: -.02em; }
.article h2 { font-size: 1.375rem; margin-top: 48px; margin-bottom: 12px; padding-top: 24px; border-top: 1px solid var(--color-border); letter-spacing: -.015em; }
.article h3 { font-size: 1.125rem; margin-top: 32px; margin-bottom: 10px; }
.article h4 { font-size: 1rem;    margin-top: 24px; margin-bottom: 8px;  }

/* First h2 directly after h1 should not have large top-margin */
.article h1 + h2 { margin-top: 32px; padding-top: 0; border-top: none; }

.article p { margin-bottom: 16px; line-height: 1.75; }
.article p:last-child { margin-bottom: 0; }

.article a { color: var(--color-accent); font-weight: 500; }
.article a:hover { text-decoration: underline; }

.article strong { font-weight: 700; color: var(--color-text); }
.article em { font-style: italic; }

.article ul, .article ol { padding-left: 1.5em; margin-bottom: 16px; }
.article li { margin-bottom: 6px; line-height: 1.7; }
.article li p { margin-bottom: 6px; }

/* Inline code */
.article code:not(pre code) {
  font-family: var(--font-mono);
  font-size: .825em;
  background: var(--color-surface-2);
  color: #be185d;
  border: 1px solid var(--color-border);
  padding: .15em .4em;
  border-radius: var(--radius-sm);
}

/* Code blocks */
.article .listingblock {
  margin: 20px 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.article pre {
  background: var(--color-code-bg);
  color: var(--color-code-text);
  padding: 20px 24px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .8125rem;
  line-height: 1.7;
  tab-size: 2;
}
.article .listingblock > .title {
  background: #16162a;
  color: #6c7086;
  font-family: var(--font-mono);
  font-size: .75rem;
  padding: 8px 24px;
  border-bottom: 1px solid #313244;
}

/* Callout numbers */
.article .conum[data-value]::after {
  display: inline-flex; align-items: center; justify-content: center;
  width: 18px; height: 18px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 9999px;
  font-family: var(--font-sans);
  font-size: .65rem;
  font-weight: 700;
  content: attr(data-value);
  vertical-align: middle;
}

/* Tables */
.article table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: .875rem;
}
.article th {
  background: var(--color-surface);
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  white-space: nowrap;
}
.article td {
  padding: 10px 14px;
  border: 1px solid var(--color-border);
  vertical-align: top;
  line-height: 1.6;
}
.article tr:nth-child(even) td { background: var(--color-surface); }

/* Admonitions */
.article .admonitionblock {
  display: flex; gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius);
  margin: 20px 0;
  font-size: .875rem;
  border-left: 3px solid;
}
.article .admonitionblock.note    { border-color: var(--color-accent); background: var(--color-accent-bg); }
.article .admonitionblock.tip     { border-color: #059669; background: #f0fdf4; }
.article .admonitionblock.warning { border-color: #d97706; background: #fffbeb; }
.article .admonitionblock.caution { border-color: #dc2626; background: #fff5f5; }
.article .admonitionblock.important { border-color: #7c3aed; background: #faf5ff; }
.article .admonitionblock td.icon {
  font-size: .7rem; font-weight: 700; text-transform: uppercase;
  letter-spacing: .06em; white-space: nowrap; padding-top: 2px;
  min-width: 70px;
}
.article .admonitionblock.note    td.icon { color: var(--color-accent); }
.article .admonitionblock.tip     td.icon { color: #059669; }
.article .admonitionblock.warning td.icon { color: #d97706; }
.article .admonitionblock.caution td.icon { color: #dc2626; }
.article .admonitionblock.important td.icon { color: #7c3aed; }
.article .admonitionblock td.content { width: 100%; }
.article .admonitionblock td.content p { margin-bottom: 0; }

/* Images */
.article img {
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  margin: 24px auto;
}
.article .imageblock.center { text-align: center; }
.article .imageblock .title { font-size: .8125rem; color: var(--color-text-muted); text-align: center; margin-top: 8px; }

/* Lead paragraph */
.article .paragraph.lead p { font-size: 1.125rem; color: var(--color-text); line-height: 1.7; margin-bottom: 24px; }

/* Tabs — @asciidoctor/tabs */
.article .tabs {
  margin: 20px 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
}
.article .tabs .tab-list {
  display: flex;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
  gap: 0;
}
.article .tabs .tab {
  padding: 10px 18px;
  font-size: .8125rem;
  font-weight: 500;
  color: var(--color-text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.article .tabs .tab:hover { color: var(--color-text); }
.article .tabs .tab.is-selected {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
  background: var(--color-bg);
  font-weight: 600;
}
.article .tabs .tab-panel { padding: 0; }
.article .tabs .tab-panel .listingblock { margin: 0; border-radius: 0; box-shadow: none; }
.article .tabs .tab-panel .listingblock pre { border-radius: 0; }

/* Horizontal rule */
.article hr { border: none; border-top: 1px solid var(--color-border); margin: 32px 0; }

/* Section anchors */
.article .anchor { float: left; padding-right: 6px; margin-left: -24px; opacity: 0; color: var(--color-text-faint); }
.article h2:hover .anchor, .article h3:hover .anchor { opacity: 1; }

/* ── Pagination ───────────────────────────────────────────── */
.pagination {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 56px;
  padding-top: 32px;
  border-top: 1px solid var(--color-border);
}
.pagination__item {
  display: flex; flex-direction: column; gap: 4px;
  padding: 16px 20px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), box-shadow var(--transition);
  text-decoration: none;
}
.pagination__item:hover { border-color: var(--color-accent); box-shadow: 0 0 0 3px var(--color-accent-bg); text-decoration: none; }
.pagination__item--next { text-align: right; }
.pagination__label { font-size: .75rem; font-weight: 600; text-transform: uppercase; letter-spacing: .06em; color: var(--color-text-muted); }
.pagination__title { font-size: .9375rem; font-weight: 600; color: var(--color-text); }

/* ── Right ToC ────────────────────────────────────────────── */
.toc {
  position: sticky;
  top: var(--topnav-h);
  height: calc(100vh - var(--topnav-h));
  overflow-y: auto;
  padding: 32px 20px 40px 24px;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border-2) transparent;
}
.toc::-webkit-scrollbar { width: 4px; }
.toc::-webkit-scrollbar-thumb { background: var(--color-border-2); border-radius: 9999px; }
.toc__inner { display: flex; flex-direction: column; gap: 12px; }
.toc__heading { font-size: .6875rem; font-weight: 700; text-transform: uppercase; letter-spacing: .09em; color: var(--color-text-faint); margin-bottom: 4px; }

#tocNav a {
  display: block;
  padding: 4px 0 4px 10px;
  font-size: .8125rem;
  color: var(--color-text-muted);
  border-left: 2px solid transparent;
  transition: color var(--transition), border-color var(--transition);
  line-height: 1.45;
  text-decoration: none;
}
#tocNav a:hover { color: var(--color-text); text-decoration: none; }
#tocNav a.is-active { color: var(--color-accent); border-left-color: var(--color-accent); font-weight: 500; }
#tocNav a[data-level="3"] { padding-left: 22px; font-size: .775rem; }

.toc__divider { border-top: 1px solid var(--color-border); margin: 4px 0; }
.toc__links { display: flex; flex-direction: column; gap: 6px; }
.toc__links a {
  display: flex; align-items: center; gap: 6px;
  font-size: .8rem;
  color: var(--color-text-muted);
  transition: color var(--transition);
  text-decoration: none;
}
.toc__links a:hover { color: var(--color-accent); text-decoration: none; }

/* ── 404 page ─────────────────────────────────────────────── */
.not-found {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: calc(100vh - var(--topnav-h));
  text-align: center; padding: 40px 20px;
  margin-top: var(--topnav-h);
}
.not-found__code {
  font-size: 6rem; font-weight: 700;
  color: var(--color-border-2);
  line-height: 1;
  letter-spacing: -.04em;
  margin-bottom: 12px;
}
.not-found__title { font-size: 1.75rem; font-weight: 700; margin-bottom: 12px; }
.not-found__desc  { font-size: 1rem; color: var(--color-text-muted); margin-bottom: 28px; }

/* ── Search highlight ─────────────────────────────────────── */
.nav__item--hidden { display: none; }

/* ── Responsive ───────────────────────────────────────────── */

/* 1280px: hide ToC */
@media (max-width: 1280px) {
  .layout { grid-template-columns: var(--sidebar-w) 1fr; }
  .toc { display: none; }
}

/* 1024px: reduce sidebar width */
@media (max-width: 1024px) {
  :root { --sidebar-w: 240px; }
}

/* 768px: collapse sidebar to off-canvas drawer */
@media (max-width: 768px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar-toggle { display: flex; }

  .sidebar {
    position: fixed;
    top: var(--topnav-h); left: 0;
    width: var(--sidebar-w);
    height: calc(100vh - var(--topnav-h));
    z-index: 90;
    transform: translateX(-100%);
    transition: transform 280ms cubic-bezier(.4,0,.2,1);
    box-shadow: var(--shadow);
  }
  .sidebar.is-open { transform: translateX(0); }

  .main__inner { padding: 24px 20px 60px; }

  .topnav__links { display: none; }

  .pagination { grid-template-columns: 1fr; }
  .pagination__item--next { text-align: left; }
}

/* 480px: tighten article padding */
@media (max-width: 480px) {
  .main__inner { padding: 20px 16px 60px; }
  .article h1 { font-size: 1.625rem; }
  .article h2 { font-size: 1.25rem; }
  .article pre { padding: 16px; font-size: .775rem; }
}